Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d9b790ea3277dc…

MALICIOUS

PDF

46.8 KB Created: 2021-06-09 02:27:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 310503cab73da358ae3259a12c46205a SHA-1: d19eda3987cef0635279c8a240700b2962c43dfa SHA-256: e1d9b790ea3277dc7dae1b349bf8a077eb10bf12260a514a5e740a9eb6c8a0d3
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/farming-simulator-money-cheat-roblox-game-hack PDF link annotation
    • https://digilib.stieama.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/pokemon-adventures-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/wurst-commands_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-25k-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/spin-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-roblox-accounts-with-robux-discord_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/click-here-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000557f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x557F 25752 bytes
SHA-256: 7bb58fc26b8e7de9d50ce6b62325e2d086c713a77bcb54a0230889aac4adffc3
font_01_sfnt_off000090c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C8 19632 bytes
SHA-256: bc0bbb0ee41a4efc6885118f35cc781a98bfdc2a127094a7cc27bc2d36906c36

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